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Other Comprehensive Income (Loss) - Activity in AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances at Beginning | $ 647,267 | $ 579,411 | $ 620,871 | $ 576,202 |
Other comprehensive income (loss) | 10,776 | (3,819) | 22,991 | (18,205) |
Balances at Ending | 657,677 | 590,649 | 657,677 | 590,649 |
Available-for-Sale Securities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances at Beginning | (11,695) | (27,644) | (23,589) | (13,005) |
Other comprehensive income (loss) before reclassifications | 10,676 | (4,028) | 22,570 | (18,638) |
Amounts reclassified from accumulated other comprehensive (loss) income | (204) | (128) | (204) | (222) |
Other comprehensive income (loss) | 10,472 | (4,156) | 22,366 | (18,860) |
Balances at Ending | (1,223) | (31,800) | (1,223) | (31,800) |
Employee Benefit Plans |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances at Beginning | (39,255) | (37,973) | (39,576) | (38,291) |
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0 |
Amounts reclassified from accumulated other comprehensive (loss) income | 304 | 337 | 625 | 655 |
Other comprehensive income (loss) | 304 | 337 | 625 | 655 |
Balances at Ending | (38,951) | (37,636) | (38,951) | (37,636) |
Accumulated Other Comprehensive (Loss) Income |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balances at Beginning | (50,950) | (65,617) | (63,165) | (51,296) |
Other comprehensive income (loss) before reclassifications | 10,676 | (4,028) | 22,570 | (18,638) |
Amounts reclassified from accumulated other comprehensive (loss) income | 100 | 209 | 421 | 433 |
Other comprehensive income (loss) | 10,776 | (3,819) | 22,991 | (18,205) |
Balances at Ending | $ (40,174) | $ (69,436) | $ (40,174) | $ (69,436) |
Accounting Standards Update 2016-01 |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  |  | $ 0
Accounting Standards Update 2016-01 | Available-for-Sale Securities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  |  | 65
Accounting Standards Update 2016-01 | Employee Benefit Plans |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  |  | 0
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive (Loss) Income |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Cumulative effect of new accounting principle |  |  |  |  | $ 65

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